त्वष्टृकर्मणः शुल्बभाण्डं समसुवर्णेन सम्यूहयेत् ॥ कZ_०२.१३.४४ ॥
tvaṣṭṛ-karmaṇaḥ śulba-bhāṇḍaṃ sama-suvarṇena samyūhayet
In the smith’s work, a copper vessel should be compounded/finished using an equal measure of gold (as the prescribed standard).
A clear equality rule simplifies auditing and reduces ambiguity that could enable skimming or under-spec finishing.